#304F88
Closest named color: Dusk Blue (#26538D). oklch(43.3% 0.102 261.6), rgb(48, 79, 136).
Aa
White text reads best on this color (8.07:1).
About this color
#304F88 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.102 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.015 away. White text reads best on it, at 8.07:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.59:1 |
| White text | 8.07:1 |
Values
| HEX | #304F88 |
| RGB | rgb(48, 79, 136) |
| HSL | hsl(219, 48%, 36%) |
| OKLCH | oklch(43.3% 0.102 261.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #304F88 | 8.07:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #304F88 | 2.59:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #304F88 text on white | 8.07:1 | AAA | Lc 87.8 | Fine for body text |
| #304F88 text on black | 2.59:1 | Fails | Lc -14.4 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ACC2E8
oklch(81% 0.059 261.3)
-
Step 400
400
#80A1DC
oklch(70.7% 0.094 261.7)
-
Step 500
500
#5F88D3
oklch(63% 0.123 261.7)
-
Step 600
600
#4671C0
oklch(55.6% 0.132 261.5)
-
Step 700
700
#385EA5
oklch(49% 0.122 261.7)
-
Step 800
800 (this color)
#304F88
oklch(43.3% 0.102 261.6)
-
Step 900
900
#29416B
oklch(37.7% 0.078 260.9)
-
Step 950
950
#18263F
oklch(27% 0.051 261.4)
#304F88 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #36548A | 0.017 |
| Deuteranopia (no green cones) | #294C87 | 0.012 |
| Tritanopia (no blue cones) | #005C65 | 0.085 |
| Achromatopsia (no color) | #505050 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F88
#304F88
oklch(43.3% 0.102 261.6)
- #694B00
#694B00
oklch(43.4% 0.089 82.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #304F88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.015
- Light Navy #155084 ΔE 0.024
- Cobalt #1E488F ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.040
- Twilight #4E518B ΔE 0.041
- Dusk #4E5481 ΔE 0.046
Use #304F88 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.